Sovereign Hydroseal has been dedicated to the field of water proofing since 1972. Amongst many of the projects the company has been involved in, the Hotel Complex in Brighton Beach, NSW, proved to be a challenging one as the leakages did not respond to conventional water proofing methods.
The hotel was constructed in saturated sand and water leakage became an almost instant problem. The bottom level, 80 X 80 metres, was 50mm under water. Leakage in the 6 lift overrun pits threatened to stop the lifts and so disrupt the hotel’s operation. This problem had existed for 2 years and Simpson Burke Pty ltd Project Consultants identified five sources of water leakage:
- The vertical joints between the concrete retaining wall and the raft slab edge that formed the car-park floor.
- The pour strips joints in the raft slab that formed the car-park floor.
- The uncapped de-watering wells which flowed back into the sump.
- Porous and cracked lift overrun pits
- Sundry and other minor construction joints and cracks.
It was decided that Scem66 water control systems would be tested in the lift overrun pits. Several holes were drilled through the surrounding pit walls and floor. The Scem66 water control systems were injected through these holes to form a solution with the incoming water at the sand/concrete interface.
The water pressure then caused the emulsion to percolate slowly through the cracks and porous concrete. Coagulation of the particles of the Scem66 water control systems occurred over a period of days until the water passages were all blocked. The effect was comparable to applying a waterproof membrane to the soil side of the structure without the need for excavation.
The successful result of the lift pits led to a performance based contract to seal the remaining area of the car park.
Within 4 weeks 90% of the leakage had been stopped and within 6 weeks the performance criteria set down in the contract had been bettered.